Apparatus for removing boiler-scales.



u. E. SANDBLOM.

APPARATUS FOR REMOVING BOILER SCALES. APPLICATION HLED OCT. 29. 1915mvcanhgr Patented Ma 2, 1916.

ourrno s'rarns Pjiill hlll GFFICE.

AEPABAT'US FOR REMOVING BOILER-SCALES.

Specification of Letters Patent.

iatented May 2, 1916.

Application filed October 25, 1915 Serial Ho. 58,648.

T 0 all whomit may concern:

Be it known that LGmnon EFRAIML Saxo- BLOM, engineer, a subject of theKing of Sweden residing at Gottenborg, in the Province of Gottenborg andBohus and Kingdom of Sweden, have invented new and useful improvementsin Apparatus for Removing Boilexficales, of which the fol lowing is aspecification.

This invention refers to apparatus for removing of scales or the likefrom boiler plates, especially from the interior surfaces of the shellof cylindrical boilers.

The object of the invention is to employ a cheap, simple and reliabledevice, adapted to be advantageously used in narrow spaces as well as inall other compartments in the boiler. Also my said implement isconvenient to use for cleansing of: the outer surfaces of boiler tubesas well as the plating of ship's hull or the like.

Another object of this invention is t provide a scale removing devicewhich in be used even by persons not particularl skilled in the handlingof such apparatus and to assist the user in a iiplying eilectivc blowson the plate to be treated.

The in ention comprises a rapi" revolv ing shaft provided with aplurality of short chains or similar flexible members such as wireropes, arranged in straight lined or spiral rows along the shaft,saidshaft being caused to revolve by the influence of some drivingmotor. As the driving motor 1 prefer a small. electric machine adaptedto be conveniently held by hand by the workman. To increase theetliciency of the apparatus the chains or flexible members are providedat their free end with a chipper or hammer preferably with sharp edges,1 use the db vice in such a way that the shaft is caused to quicklyrevolve and thereby is held in the vicinity of the plate to be treated,parallel with same so that the free ends of the flexible membersrespectively their chippers or hammers are caused by the centrifugalforce to strike the plate with very often repeated blows until thescales or incrustations are knocked off The device forms a readilymanipulated self-contained mechanism which is, as a whole, rigid and canbe inserted through a manhole or the like and held firmly adjacent tothe part it is desired to clean.

In the accompanying drawing Figure l n of the shaft showing the "led outin working position. i view of the chipper or hama section through aboiler the use of the improved device -1C\I'(l in a rather narrow space.i s slew of the complete appaire in re vs along suitable length of theshaft and may cal rows.

be set in straight lines or heliliniit myself to the special em- 7ntilius '2 r lace the ch suitable flexible members but I prefer to mrtchains comprising circular links as and th m to be best suited for the i11 shape of the links decs the wear and tear of the link iron, as theone link will be free to slide all around the neighboring link, will notbe the case if oblong: or usual chain links were used, be cause it isnot possible in such shaped links for the one link to move but on arather limited portion the neighboring link, causing th' to be veryquickly Worn out.

In the free end of each chain or flexible member ihcre is suspended atchipper or work.

hammer 0, preferably of the form clearly illustrated in the Figs. 1 and2 and provided with a rather sharp edge Z around the outermost end, inthe vicinity of which the cent-er of gravity of the hammer-body issituated, far from the Suspension end for the purpose oi increasing theinfluence by the centrifugal force when revolving the shaft with thechains swung freely around same.

The shaft (1, projects from an electric motor 2. presided with a handlef by means of which the apparatus is readily manipulated inside theboiler 72,, In very narrow spac such instance between the boiler shell.nd a stay 5 it sometimes happens that the device cannot be introducedso far 110 as necessary, and to overcome these difiiculties the shaft (1may be prolonged rather extensively which however would decrease theefiicacy of the apparatus on account of the flexibility of the thinshaft. Such vibrations may be avoided by surrounding the revolving shafta on the length between the motor 6 and the working end with a tube 2'(Fig. 5) attached to the motor 6 in any suitable way. A certain amountof lateral I110- tion of the rather long shaft a may be allowed by meansof a universal joint me One of the important features of my improvedinstrument is to be found in its adaptability to suit narrow spaces,such as illustrated in Fig. 3. In such places the flexible members I;get wound around the shaft a, thus automatically adjusting their lengthso as not to injure the plates by too hard blows but to soften same justas needed. The mode of attaching the chains 6 on to the shaft a by meansof the split pins d insures a handy replacing of worn chains by freshones and consequently the cleaning work can be continued without unduedelay.

Having thus described my said invention and how the same is to beperformed what 1 claim as new and desire to protect by Letters Patentis:

An apparatus for removing incrustations comprising a rigid rotatableshaft, a motor directly mounted on the end of said shaft so as to forman integral portable member therewith, a plurality of independentchainmembers connected at their inner ends to said shaft and formed ofcircular links, and a conical shaped chipping member attached to theouter end of each chain member having a sharp circular cutting edge atits outer

